Correlative digital image correlation and infrared thermography measurements for the investigation of the mesoscopic deformation behaviour of foams

Jung, Anne; Majthoub, K. Al; Jochum, Ch.; Kirsch, Susanne‐Marie; Welsch, Felix; Seelecke, Stefan; Diebels, Stefan

doi:10.1016/j.jmps.2019.06.009

Cited by 23 publications

(16 citation statements)

References 63 publications

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“…Only a few of these mechanical investigations were extended by a digital image correlation (DIC) using a high-speed camera or the analysis of impact damage areas using thermographic images. [11,39,49] In this study, the effect of strain rate on the compressive stress/strain behavior of open-cell Ni/PU hybrid composite metal foams was investigated. Strain rates ranged from quasistatic (10 À3 s À1 ) by servohydraulic loading to low-velocity impact (550 s À1 ) using a drop-weight impact rig.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Strain‐Rate Effects in Ni/PU Hybrid Foams under Low‐Impact Velocities

et al. 2020

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Metal foams are often used as energy absorbers and lightweight materials. Inspired by a natural blueprint, open‐cell metal foams can significantly reduce the mass of a structure. The innovative manufacturing process of electrodeposition provides the possibility to customize the coating layer thickness of nickel (Ni) on a polyurethane (PU) precursor foam. Consequently, the mechanical properties can be adjusted according to the requirements of the expected application. Herein, quasistatic compression tests and low‐velocity impact tests are conducted on open‐cell Ni/PU hybrid foams to investigate the strain‐rate effects for strain rates in the range of 10−3 to 550 s−1. Furthermore, digital image correlation is performed with the intention of comparing the micromechanical deformation mechanisms under quasistatic loading with those under dynamic loading. For the first time, the heat evolution at different impact velocities of metal foams has been investigated with an infrared camera.

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Section: Introductionmentioning

confidence: 99%

Investigation of Strain‐Rate Effects in Ni/PU Hybrid Foams under Low‐Impact Velocities

et al. 2020

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“…For the pure tensile, compression and torsion tests and for the combined tension-torsion and compression-torsion experiments with 50% of the axial failure load, strain fields were obtained by 3D-DIC and are displayed in the unwrapped cylindrical surface by means of the software h5pyViewer © (Thierry Zamofing, Paul Scherrer Institute, Switzerland). DIC is a full-field optical method, which evaluates displacements and strains by tracking the motion of the specimen'speckle pattern during the experiment [9]. The input values for the facet size and the grid spacing were 29 pixels and 3 pixels, respectively.…”

Section: Methodsmentioning

confidence: 99%

Multiaxial Investigation of PVC Foams and Analysis of the Deformation Mechanism by 3d-Dic

Concas

Diebels

Jung

2019

APP

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Closed-cell polyvinylchloride (PVC) foams are widely used as core for sandwich composites for applications, in which multiaxial loads are involved. In the present work a wide range of uniaxial (tension, compression and torsion) and multiaxial experiments (both simultaneous tension-torsion and compression-torsion) were conducted on a high performance PVC foam. Failure data for each experiment were collected and depicted in the invariants plane. The whole cylindrical surface of the specimen was monitored by means of an 8-camera-system, strain fields were obtained by 3D-DIC. Hence, the occurrence and the evolution of deformation bands were inspected. The usage of an 8-camera system was essential for the observation of the deformation mechanism, especially for pure compression, pure torsion and combined axial load-torsion, in which the arising of deformation bands is affected by the occurrence of buckling and the orthotropy of the foam.

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“…Dinh Ba Le et al [5] applied a DIC system for reliable deformation measurement of concrete structures at high temperature. Jung et al [6] investigated the mesoscopic deformation behavior of open-cell metal/polymer hybrid foams by using correlative DIC and infrared thermography measurements. IR thermography equipment is usually composed of optical system, spectral filtering, infrared detector array, video image processing and so on [7].…”

Section: Introductionmentioning

confidence: 99%

Measurements of Temperature Distribution for High Temperature Steel Plates Based on Digital Image Correlation

Wang

Zhen

et al. 2019

Materials

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Temperature distribution is an important process parameter of steel plates during electromagnetic induction heating treatment. This study uses the digital image correlation method to develop an effective non-contact temperature measurement that allows obtaining valuable information about the temperature value of a high temperature steel plate specimen and analyzing its temperature distribution. A principle of thermal radiation temperature measurement based on the color chagre couled device (CCD) technology was introduced. The image processing system encapsulates the image update module, form mode module, image event module and temperature analysis module. The error analysis and temperature calibration were carried out to make sure the error deviation of the measurement system was within a small range. The temperature distribution of B1500HS at high temperature was analyzed by the designed measurement system which was in good agreement with the result from Raynger 3i Plus temperature gun, indicating that the measurement system based on image processing basically meets the requirements of temperature distribution measurement of a high temperature steel plate, and provides an important reference for a high temperature steel plate in non-contact temperature distribution measurement.

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Correlative digital image correlation and infrared thermography measurements for the investigation of the mesoscopic deformation behaviour of foams

Cited by 23 publications

References 63 publications

Investigation of Strain‐Rate Effects in Ni/PU Hybrid Foams under Low‐Impact Velocities

Investigation of Strain‐Rate Effects in Ni/PU Hybrid Foams under Low‐Impact Velocities

Multiaxial Investigation of PVC Foams and Analysis of the Deformation Mechanism by 3d-Dic

Measurements of Temperature Distribution for High Temperature Steel Plates Based on Digital Image Correlation

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